20001823 has 2 divisors, whose sum is σ = 20001824. Its totient is φ = 20001822.

The previous prime is 20001811. The next prime is 20001833. The reversal of 20001823 is 32810002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001797 and 20001806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000911 + 10000912.

It is an arithmetic number, because the mean of its divisors is an integer number (10000912).

Almost surely, 2^20001823 is an apocalyptic number.

20001823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001823 is an equidigital number, since it uses as much as digits as its factorization.

20001823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20001823 is about 4472.3397679514. The cubic root of 20001823 is about 271.4500087144.

Adding to 20001823 its reverse (32810002), we get a palindrome (52811825).

The spelling of 20001823 in words is "twenty million, one thousand, eight hundred twenty-three".